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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7278cf3a7c755374c051e22ec9541bedf3e088499f97ed0d9d694103eb76fc' 
  AND token = 'ynNACYbt7FvxRlQv3uQlz+0D+Hl60KR8mAzRVMQ6clc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}